Avast is one of the better anti-malware apps available for Windows, but it’s not without its flaws. Thankfully you can rid the program of its annoyances with some easy steps.
Enable automatic program updates
Avast! will automatically download new virus definitions in the background, but only alert you of program updates by default. Program updates often fix bugs and close security holes, hence should be installed automatically and as soon as possible. To enable it, go to the Updates section in Settings, and choose Automatic update under Program.